The Comanchean of Central Kcuisas. 219 



Mentor and the associated unfossiliferoiis shales and sand- 

 stones. Fossils are extremely abundant in the Kiowa. Prof. 

 C. N. Gould obtained Kiowa shells about eight miles southeast 

 of Lindsborg-, while Prof. J. A. Udden obtained them a short 

 distance west of that city (9:180). 



In the road about three miles north of the village of Mar- 

 quette, underlying cross-laminated sandstones similar to those 

 beneath the Mentor at the Natural Corral, there are outcrops 

 of a cone-in-cone gypsum similar to that at the Corral. Near 

 by. in an arroyo, is an exposure of about eight feet of shales 

 and sandstones, which are like those above the cone-in-cone 

 layer at the Corral. In section 33 of Summit township, Mc- 

 Pherson county, is an exposure of about eight feet of blue 

 shales which are overlain by at least six feet of cross-laminated 

 yellow sandstone. In the shale is a lens of the cone-in-cone 

 gypsum. No fossiliferous beds were seen at either one of these 

 localities. 



The above are all of the localities in central Kansas where 

 the writer has been able to find beds of Kiowa aspect, or to 

 which reference has been made in the literature. The map has 

 the localities where the Kiowa shell limestones are known to 

 occur indicated by the letter K. 



The Mentor Beds. In the Mentor beds it is proposed to in- 

 clude only the fossiliferous sandstones and such other beds 

 associated therewith as can be proven to be of marine origin. 

 The thickness of these beds totals about ten feet. The unfos- 

 siliferous beds below the Mentor to the Kiowa belong appar- 

 ently to another type of deposition and should be given another 

 name. 



Sections with good exposures of the Mentor are extremely 

 rare, and such were seen only at the Natural Corral and imme- 

 diate vicinity, and to the west of Smolan. At many localities 

 were seen sections showing strata of a lithology similar to that 

 of the unfossiliferous beds below the Mentor. These are con- 

 sidered to belong to the Comanchean, but not to the Mentor. 



The Mentor beds are quite variable locally. At the type 

 locality they consist of dark brown, friable, fine-grained sand- 

 stone. At the Natural Corral the rock is a heavy-bedded brown 

 sandstone of coarser grain than at Mentor, and in places it 

 carries many of the ferruginous concretions which are so char- 

 acteristic of the Dakota. Fossils are not extremelv abundant 



